diff --git a/contracts/IdentityPromises.sol b/contracts/IdentityPromises.sol
index 404be71..7774482 100644
--- a/contracts/IdentityPromises.sol
+++ b/contracts/IdentityPromises.sol
@@ -16,11 +16,11 @@ contract IdentityPromises is IdentityRegistry , IdentityBalances {
 
     }
 
-    function clearPromise(bytes32 receiverAndSigns, uint256 seq, uint256 amount,
+    function clearPromise(bytes32 receiverAndSigns, bytes32 extraDataHash, uint256 seq, uint256 amount,
         bytes32 sender_R, bytes32 sender_S,
         bytes32 receiver_R, bytes32 receiver_S) public returns (bool) {
         (address receiver, uint8 sender_V, uint8 receiver_V) = Utils.unpackSignatureAndSigns(receiverAndSigns);
-        bytes32 promiseHash = keccak256(abi.encodePacked(ISSUER_PREFIX, receiver , seq , amount));
+        bytes32 promiseHash = keccak256(abi.encodePacked(ISSUER_PREFIX, extraDataHash, receiver, seq , amount));
 
         address sender = ecrecover(promiseHash, sender_V , sender_R, sender_S);
         address recoveredReceiver = ecrecover(keccak256(abi.encodePacked(RECEIVER_PREFIX, promiseHash , sender)), receiver_V , receiver_R, receiver_S);
diff --git a/promises/clearing.go b/promises/clearing.go
index 412a448..670c601 100644
--- a/promises/clearing.go
+++ b/promises/clearing.go
@@ -68,8 +68,13 @@ func (pc *PromiseClearing) ClearReceivedPromise(promise * ReceivedPromise) error
 	var packedAddressAndSigns [32]byte
 	addressAndSigns := append([]byte{issuerSig.V, receiverSig.V} , promise.Receiver.Bytes()...)
 	copy(packedAddressAndSigns[10:32] , addressAndSigns)
+
+	var extraDataHash[32]byte
+	copy(extraDataHash[:], promise.ConsumerHash())
+
 	_ , err = pc.ClearPromise(
 		packedAddressAndSigns,
+		extraDataHash,
 		big.NewInt(promise.SeqNo),
 		big.NewInt(promise.Amount),
 		issuerSig.R,
diff --git a/promises/promise.go b/promises/promise.go
index e9c707e..32f5759 100644
--- a/promises/promise.go
+++ b/promises/promise.go
@@ -9,6 +9,7 @@ import (
 )
 
 type Promise struct {
+	ServiceConsumer common.Address
 	Receiver common.Address
 	SeqNo    int64
 	Amount   int64
@@ -16,8 +17,12 @@ type Promise struct {
 
 const issuerPrefix = "Issuer prefix:"
 
+func (p * Promise) ConsumerHash() []byte {
+	return crypto.Keccak256(p.ServiceConsumer.Bytes())
+}
+
 func (p * Promise) HashBytes() []byte {
-	return crypto.Keccak256([]byte(issuerPrefix) , p.Receiver.Bytes(), abi.U256(big.NewInt(p.SeqNo)), abi.U256(big.NewInt(p.Amount)))
+	return crypto.Keccak256([]byte(issuerPrefix) , p.ConsumerHash(), p.Receiver.Bytes(), abi.U256(big.NewInt(p.SeqNo)), abi.U256(big.NewInt(p.Amount)))
 }